/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.executor.handler.ddl;

import com.alibaba.polardbx.common.exception.TddlRuntimeException;
import com.alibaba.polardbx.common.exception.code.ErrorCode;
import com.alibaba.polardbx.common.utils.GeneralUtil;
import com.alibaba.polardbx.executor.ddl.job.factory.DropTableGroupJobFactory;
import com.alibaba.polardbx.executor.ddl.newengine.job.DdlJob;
import com.alibaba.polardbx.executor.spi.IRepository;
import com.alibaba.polardbx.gms.tablegroup.TableGroupConfig;
import com.alibaba.polardbx.gms.topology.DbInfoManager;
import com.alibaba.polardbx.optimizer.OptimizerContext;
import com.alibaba.polardbx.optimizer.context.ExecutionContext;
import com.alibaba.polardbx.optimizer.core.rel.ddl.BaseDdlOperation;
import com.alibaba.polardbx.optimizer.core.rel.ddl.LogicalDropTableGroup;
import com.alibaba.polardbx.optimizer.core.rel.ddl.data.DropTableGroupPreparedData;
import com.alibaba.polardbx.optimizer.tablegroup.TableGroupInfoManager;

/**
 * Created by luoyanxin.
 *
 * @author luoyanxin
 */
public class LogicalDropTableGroupHandler extends LogicalCommonDdlHandler {

    public LogicalDropTableGroupHandler(IRepository repo) {
        super(repo);
    }

    @Override
    protected DdlJob buildDdlJob(BaseDdlOperation logicalDdlPlan, ExecutionContext executionContext) {
        LogicalDropTableGroup logicalDropTableGroup = (LogicalDropTableGroup) logicalDdlPlan;
        return DropTableGroupJobFactory
            .create(logicalDropTableGroup.relDdl, logicalDropTableGroup.getPreparedData(),
                executionContext);
    }

    @Override
    protected boolean validatePlan(BaseDdlOperation logicalDdlPlan, ExecutionContext executionContext) {
        LogicalDropTableGroup logicalDropTableGroup = (LogicalDropTableGroup) logicalDdlPlan;
        DropTableGroupPreparedData preparedData = logicalDropTableGroup.getPreparedData();
        String schemaName = preparedData.getSchemaName();
        if (schemaName == null) {
            schemaName = executionContext.getSchemaName();
        }
        boolean isNewPart = DbInfoManager.getInstance().isNewPartitionDb(schemaName);
        if (!isNewPart) {
            throw new TddlRuntimeException(ErrorCode.ERR_GMS_GENERIC,
                "can't execute the drop tablegroup command in non-partitioning database");
        }
        String tableGroupName = preparedData.getTableGroupName();
        boolean isIfExists = preparedData.isIfExists();
        TableGroupInfoManager tableGroupInfoManager =
            OptimizerContext.getContext(schemaName).getTableGroupInfoManager();
        TableGroupConfig tableGroupConfig = tableGroupInfoManager.getTableGroupConfigByName(tableGroupName);
        if (tableGroupConfig != null && !GeneralUtil.isEmpty(tableGroupConfig.getAllTables())) {
            throw new TddlRuntimeException(ErrorCode.ERR_PARTITION_MANAGEMENT,
                String.format("The tablegroup[%s] is not empty, can't drop it", tableGroupName));
        } else if (tableGroupConfig == null && !isIfExists) {
            throw new TddlRuntimeException(ErrorCode.ERR_PARTITION_MANAGEMENT,
                String.format("drop tablegroup error, tablegroup[%s] is not exist", tableGroupName));
        }
        return false;
    }
}
